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Ok, there was a bag of brown rice flour stored inside a bag of vermiculite for almost a year. The brown rice flour turned all gross and black. My question is, would the vermiculite still be okay to use, since it did not directly touch the brown rice flour?

lol, no I don't absolutely have to use it. I'm just cheap and don't want to go buy more vermiculite. I don't really know the nature of brown rice flour, but I don't think it was mold. Nevertheless, could have leaked toxins into the bag. I'll just go buy some to be on the safe side.